Bunn TU3QF-EZ User manual

Brand: Bunn

Model: TU3QF-EZ

Type: User manual

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

PHONE: (217) 529-6601 FAX: (217) 529-6644

www.bunnomatic.com

TU3QF-EZ

OPERATING & SERVICE MANUAL

BUNN

DISCONTINUED VERSION

The information in this manual

is no longer current.

Page 2

CONTENTS

User Notices ............................................................. 3

Electrical Requirements ............................................ 4

Plumbing Requirements ........................................... 4

Initial Set-Up............................................................. 5

Operating Controls.................................................... 5

Cleaning.................................................................... 6

Tea Brewing .............................................................. 6

Adjustments and Optional Settings........................... 7

Troubleshooting ........................................................ 8

Service.................................................................... 15

Wiring Schematics.................................................. 26

INTRODUCTION

This equipment will brew a four-gallon batch of fresh tea into an awaiting dispenser. The tea will be dispensed at

approximately room temperature to conserve ice. The brewer also has a hot water faucet for allied beverage use. The

brewer is only for indoor use on a sturdy counter or shelf.

WARRANTY

Bunn-O-Matic Corp. (“Bunn”) warrants the equipment manufactured by it to be commercially free from defects

in material and workmanship existing at the time of manufacture and appearing within one year from the date of

installation. In addition:

1.) Bunn warrants electronic circuit and/or control boards to be commercially free from defects in material and

workmanship for three years from the date of installation.

2.) Bunn warrants the compressor on refrigeration equipment to be commercially free from defects in material

and workmanship for two years from the date of installation.

3.) Bunn warrants that the grinding burrs on coffee grinding equipment will grind coffee to meet original factory

screen sieve analysis for three years from date of installation or for 30,000 pounds of coffee, whichever comes first.

This warranty does not apply to any equipment, component or part that was not manufactured by Bunn or that,

in Bunn’s judgement, has been affected by misuse, neglect, alteration, improper installation or operation, improper

maintenance or repair, damage or casualty.

THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY, WRITTEN OR

ORAL, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF EITHER

MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. The agents, dealers or employees of Bunn are

not authorized to make modifications to this warranty or to make additional warranties that are binding on Bunn.

Accordingly, statements by such individuals, whether oral or written, do not constitute warranties and should not

be relied upon.

The Buyer shall give Bunn prompt notice of any claim to be made under this warranty by telephone at (217)

529-6601 or by writing to Post Office Box 3227, Springfield, Illinois, 62708-3227. If requested by Bunn, the Buyer

shall ship the defective equipment prepaid to an authorized Bunn service location. If Bunn determines, in its sole

discretion, that the equipment does not conform to the warranty, Bunn shall repair the equipment with no charge

for parts during the warranty period and no charge for labor by a Bunn Authorized Service Representative during

the warranty period. If Bunn determines that repair is not feasible, Bunn shall, at its sole option, replace the

equipment or refund the purchase price for the equipment.

THE BUYER’S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE SALE

OF THIS EQUIPMENT, WHETHER DERIVED FROM WARRANTY OR OTHERWISE, SHALL BE LIMITED, AS

SPECIFIED HEREIN, TO REPAIR OR, AT BUNN’S SOLE OPTION, REPLACEMENT OR REFUND.

In no event shall Bunn be liable for any other damage or loss, including, but not limited to, lost profits, lost sales,

loss of use of equipment, claims of Buyer’s customers, cost of capital, cost of down time, cost of substitute

equipment, facilities or services, or any other special, incidental or consequential damages.

33030 082901

Page 3

#00831.0000

#00656.0000

#03408.0000

#03409.0000

USER NOTICES

Carefully read and follow all notices on the equipment and in this manual. They were written for your protec-

tion. All notices on the equipment should be kept in good condition. Replace any unreadable or damaged labels.

33030 052600

Page 4

ELECTRICAL REQUIREMENTS

CAUTION - The brewer must be disconnected from the power source until specified in

Initial Set-Up.

120V model brewer requires 2-wire, grounded service rated 120 volts ac, 15 amp, single phase, 60 Hz.

Proceed as follows:

Electrical Hook-Up

CAUTION – Improper electrical installation will damage electronic components.

1. An electrician must provide electrical service as specified.

2. Using a voltmeter, check the voltage at the electrical source.

3. Connect the brewer to the power source.

4. If plumbing is to be hooked up later be sure the brewer is disconnected from the power source. If plumbing

has been hooked up, the brewer is ready for

Initial Set-Up

PLUMBING REQUIREMENTS

The brewer must be connected to a cold water system with operating pressure between 20 and 90 psi (138

and 620 kPa) from a

⁄2" or larger supply line. A shut-off valve should be installed in the line before the brewer.

Install a regulator in the line when pressure is greater than 90 psi(620 kPa) to reduce it to 50 psi(345 kPa). The

water inlet fitting is

⁄4" flare.

NOTE - Bunn-O-Matic recommends

⁄4" copper tubing for installations of less than 25 feet and

⁄8" for more than

25 feet from the

⁄2" water supply line. A tight coil of copper tubing in the water line will facilitate moving the

brewer to clean the countertop. Bunn-O-Matic does not recommend the use of a saddle valve to install the

brewer. The size and shape of the hole made in the supply line by this type of device may restrict water flow.

This equipment must be installed to comply with the Basic Plumbing Code of the

Building Officials and Code Administrators International, Inc. (BOCA)

and the Food Service Sanitation Manual of the Food and Drug Administration (FDA).

P2183

33030 052600

1. Remove the shipping cap from the bulkhead fitting on the rear of the brewer.

2. Attach the flare fitting from the short piece of tubing on the strainer/flow control (supplied) to the water inlet

fitting at the rear of the brewer.

3. Flush the water line and securely attach it to the flare fitting on the strainer/flow control.

4. Turn on the water supply.

Page 5

INITIAL SET-UP

CAUTION - The brewer must be disconnected from the power source throughout the

Initial Set-up

, except when

specified in the instructions.

1. Insert an empty funnel into the funnel rails.

2. Place an empty container of at least 4 gallons capacity under the funnel.

3. Connect the brewer to the power source.

4. Place the "ON/OFF" switch in the "ON" position. Tank will start to fill automatically.

5. Water will flow into the tank and dispense for approximately eighteen minutes, then cycle will stop.

6. Heater circuit will activate automatically.

7. Wait approximately fifty minutes for the water in the tank to heat to the proper temperature. The ready light

will be activated when the brewer reaches the proper temperature.

8. Press the START switch to begin a brew cycle. Once water comes out of the sprayhead, place the "ON/OFF"

switch in the "OFF" position. This will dispense the expansion water in the tank.

9. Empty contents of the container through the faucet.

10. Place the "ON/OFF" switch in the "ON" position then momentarily press and release the "START" switch.

11. Allow the cycle to finish and measure the amount of water in the container. It should be 512 ounces ±2. Refer

to the adjustments section of this manual should the volume need to be increased or decreased.

The brewer is now ready for use in accordance with the Tea Brewing instructions.

OPERATING CONTROLS

A. ON/OFF Switch

ON - Placing the switch in the "ON" position allows the start switch to activate a timed brew cycle for four gallons

of tea.

OFF - Placing the switch in the "OFF" position stops the brew cycle. Stopping a brew cycle after it has been started

will not stop the flow of water into the funnel until the tank syphons down to its proper level. The switch should

always be placed in this position after a brew cycle and whenever the brewer is unattended.

B. Start Switch

Starts a brew cycle when the ON/OFF switch is in the "ON" position.

C. Ready Indicator

This indicator glows when preselected brew water temperature has been achieved. It is also used for diagnostic

testing of brewer.

D. Sanitize Switch

Starts a sanitize cycle when pressed and released. This functions when the ON/OFF switch is in the "ON" position.

E. Green Tea/Black Tea Faucet Switch

Dispenses hot water for either green tea or black tea.

33030 070300

Page 6

CLEANING

CAUTION - CLEAN AND SANITIZE YOUR ICED TEA BREWER DAILY

1. Remove and thoroughly clean the entire brew funnel. The funnel tip and screen must be free from any tea

particles or residue. Reassemble the funnel.

2. Place the ON/OFF switch in the "OFF" position. Remove and thoroughly rinse the sprayhead. The holes must

be open and clear of any mineral deposits. Wipe the sprayhead panel clean with a damp cloth.

3. Insert the deliming spring into the sprayhead fitting until no more than two inches is visible and move it in

and out 5 or 6 times. Insert the spring into the air vent hole in the sprayhead panel and move it in and out 5

or 6 times. Reattach the sprayhead.

4. Wash the entire outside surface of the brewer with a clean damp cloth.

5. Place the empty 4 gallon tea reservoir on the base. Insert funnel into rails. Make sure faucet is closed and lid

cover is removed.

6. Place the ON/OFF switch to the "ON" position. Press and release the "Sanitize" Switch.

7. After sanitize cycle ends, let reservoir soak, then empty contents. Let reservoir air dry.

CAUTION - DO NOT KEEP BREWED ICED TEA OVERNIGHT. THE SERVER MUST BE CLEANED DAILY.

TEA BREWING

1. Begin each brew cycle with a clean empty brew funnel and server. (Be sure the server lid doesn’t interfere

with the flow of dilution water.)

2. Place the packet of fresh tea leaves into the funnel.

3. Level the bed of tea leaves by gently shaking.

4. Slide the funnel into the funnel rails until it stops.

5. Place the ON/OFF switch in the "ON" position.

6. Momentarily press the start switch.

CAUTION - The funnel contains hot liquids. Remove funnel slowly.

7. Carefully remove the brew funnel and discard the used packet when tea no longer drips from the funnel tip.

8. Place the ON/OFF switch in the "OFF" position to prevent a false start.

9. Fresh tea is available at the faucet on the dispenser.

33030 063000

Page 7

TU3QF-EZ ADJUSTMENTS & OPTIONAL SETTINGS

P1864

33030 082901

P2174

ADJUSTING BREW VOLUMES

IMPORTANT - Tank must be full and refill solenoid shut off prior to making these adjustments.

Sprayhead must be installed while making these adjustments.

INCREASING THE BREW VOLUME: Use the following steps when you want to increase the amount of water for

each brew cycle.

1. Place a funnel in the funnel rails and an empty container of at least four gallons beneath the funnel.

2. Turn ON the brewer.

3. Press and hold the brew start switch until you hear the brew solenoid click on-and-off three times (approxi-

mately 5 seconds). Release the switch.

4. Momentarily press and release the brew start switch once for each two seconds to be added to the prior

setting.

5. Allow the cycle to finish.

The brewer is now set to dispense this amount of water for each subsequent brew cycle.

DECREASING THE BREW VOLUME: Use the following steps when you want to decrease the amount of water for

each brew cycle.

1. Place a funnel in the funnel rails and an empty container of at least 4 gallons beneath the funnel.

2. Turn ON the brewer.

3. Momentarily press and release the brew start switch once for each two second period to be removed from

the prior setting.

4. Press and hold the brew start switch until you hear the brew solenoid click on-and-off three times (approxi-

mately 5 seconds). Release the switch.

5. Allow the cycle to finish.

The brewer is now set to dispense this amount of water for each subsequent brew cycle.

Page 8

TROUBLESHOOTING

A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems

encountered. If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic

Technical Service Department.

• Inspection, testing, and repair of electrical equipment should be performed only by qualified service person-

nel.

• All electronic components have 120 volt ac and low voltage dc potential on their terminals. Shorting of

terminals or the application of external voltages may result in board failure.

• Intermittent operation of electronic circuit boards is unlikely. Board failure will normally be permanent. If an

intermittent condition is encountered, the cause will likely be a switch contact or a loose connection at a

terminal or crimp.

• Solenoid removal requires interrupting the water supply to the valve. Damage may result if solenoids are

energized for more than ten minutes without a supply of water.

• The use of two wrenches is recommended whenever plumbing fittings are tightened or loosened. This will

help to avoid twists and kinks in the tubing.

• Make certain that all plumbing connections are sealed and electrical connections tight and isolated.

• This brewer is heated at all times. Keep away from combustibles.

WARNING – • Exercise extreme caution when servicing electrical equipment.

• Unplug the brewer when servicing, except when electrical tests are specified.

• Follow recommended service procedures.

• Replace all protective shields or safety notices.

Before troubleshooting this brewer, check for the following:

Before servicing the brewer, make sure that voltage is present at control board. Check for voltage across pins

1 & 7 of the eight pin J1 connector (black and white wires). If voltage is present, proceed with testing. If

voltage is not present, check wiring and voltage at socket. Correct the problem and retest before proceeding

with testing.

33030 082901

BREW VOLUME SETUP: Use the following steps when the setting is unknown or a different circuit board is being

installed.

1. Place a funnel in the funnel rails and an empty container of at least four gallons beneath the funnel.

2. Turn ON the brewer.

3. Press and hold the brew start switch until you hear the brew solenoid click on-and-off three times (approxi-

mately 5 seconds). Release the switch.

4. Allow the cycle to continue until the desired amount of water is dispensed and then turn OFF the brewer.

The brewer is now set to dispense this amount of water for each subsequent brew cycle.

SANITIZE VOLUME: Use the above procedure substituting the sanitize switch for the brew start switch. The

volume for the sanitize function is set for 3 gallons.

ADJUSTING BREW VOLUMES (CONT.)

Page 9

TROUBLESHOOTING (cont.)

PROBLEM

PROBABLE CAUSE REMEDY

BREWING CIRCUIT

Brew or sanitize cycle will not start 1. Ready light flashing

2. No water

3. No power or incorrect voltage to

the brewer

4. ON/OFF switch not in the "ON" po-

sition

5. START Switch

6. Low water temperature (Brew

lockout is enabled)

7. Brew solenoid valve

8. Control board

Brewer has shut down due to

malfunction (See Diagnostic Chart

in manual, page 14, or under top

lid of brewer).

Water lines and valves to the brewer

must be open.

Check for voltage across the black

and white terminals at the power

source.

The indicator lamp must be lit

Refer to

Service -

Start Switch for

testing procedures. See page 23

Allow brewer to heat until ready

lamp is lit, or disable the brew lock-

out feature. See page 7

Refer to

Service -

Brew Solenoid

Valve for testing procedures. See

page 16

Refer to

Service -

Control Board for

testing procedures. See page 25

33030 052600

Page 10

TROUBLESHOOTING (cont.)

PROBLEM PROBABLE CAUSE REMEDY

BREWING CIRCUIT (cont.)

Set up brewer according to instruc-

tions in section

Adjustments

-Brew

Volumes. (See page 7) Using a stop

watch or second hand, time the

length of the brew cycle. Record

this time inside the top lid. If ser-

vice is ever needed again, use the

time as reference to determine if

time has changed.

Inspect the sprayhead tube and

sprayhead for excessive lime de-

posits. Delime as required.

Refer to

Service -

Brew Solenoid

Valve for testing procedures. See

page 16

A) Direction of flow arrow must be

pointing towards brewer.

B) Remove flow control and check

for obstructions. Clear or replace.

1. Brew volume

2. Lime build up

3. Brew Solenoid Valve

4. Flow Control

Consistently low beverage level in

the dispenser or beverage over-

flows dispenser

33030 052600

Page 11

TROUBLESHOOTING (cont.)

PROBLEM PROBABLE CAUSE REMEDY

BREWING CIRCUIT (cont.)

Dripping from sprayhead

Weak beverage

Drip out time too long

1. Lime build up

2. Brew Solenoid Valve

1. Sprayhead

2. Water temperature

3. Funnel loading

1. Funnel Tip

Inspect the tank assembly for ex-

cessive lime deposits. Delime as re-

quired.

Refer to

Service -

Brew Solenoid

Valve for testing procedures. See

page 16

A five-hole stainless steel spray-

head must be used for proper ex-

traction.

Place an empty brew funnel on an

empty vessel of at least 4 gallons

beneath the sprayhead. Initiate

brew cycle and check the water

temperature immediately below the

sprayhead with a thermometer. The

reading must not be less than 5°F

below set temperature. Adjust the

temperature setting to increase the

water temperature. Refer to

Initial

Set-up

instructions.

The packet must be centered in the

funnel and the bed of tea leaves lev-

eled by shaking gently.

The brew funnel should be cleaned

thoroughly before each brew cycle

to lessen the chance of tea leaf par-

ticles clogging the funnel tip.

33030 052600

Page 12

TROUBLESHOOTING (cont.)

PROBLEM PROBABLE CAUSE REMEDY

Water does not heat to proper

temperature

IMPORTANT: Make sure no tem-

perature tests are taken before the

ready light is "ON". Tank tempera-

ture must be stabilized before read-

ings are taken.

1. Ready light flashing

2. Water not touching temperature

probe

3. Temperature Probe

4. Limit Thermostat

5. Tank Heater

Brewer has shut down due to

malfunction (See Diagnostic Chart

in manual, page 14, or under top

lid).

Remove probe and grommet. Look

into hole on tank lid. Water must

be within one inch from top of tank.

Remove the probe from the grom-

met and submerge in a water bath

of approximately 70°F. Connect an

ohmmeter to pins 2 and 3 of the J5

connector. At 60°F the reading

should be 15.3k ± 2k OHMS, at

70°F the reading should be 11.8k ±

2k OHMS, and at 80°F the reading

should be 9.3k ± 2k OHMS. If the

probe is within these parameters,

reconnect the J5 plug to the con-

trol board.

Refer to

Service -

Limit Thermostat

for testing procedures. See page 20

Refer to

Service -

Tank Heater for

testing procedures. See page 24

HEATING CIRCUIT (cont.)

33030 052600

Page 13

TROUBLESHOOTING (cont.)

PROBLEM PROBABLE CAUSE REMEDY

Spitting or excessive steaming

Brewer is making unusual noises

1. Lime build up on temperature

probe, tank or tank heater

2. Temperature Probe

3. Control Board

1. Plumbing lines

2. Water supply

3. Lime build up

Inspect probe and tank assembly

for excessive lime deposits. Delime

as required.

Remove the probe from the grom-

met and submerge in a water bath

of approximately 70°F. Connect an

ohmmeter to pins 2 and 3 of the J5

connector. At 60°F the reading

should be 15.3k ± 2k OHMS, at

70°F the reading should be 11.8k ±

2k OHMS, and at 80°F the reading

should be 9.3k ± 2k OHMS. If the

probe is within these parameters,

reconnect the J5 plug to the con-

trol board.

Set the temperature to 205°F. Let

tank temperature stabilize. If tem-

perature in tank is above tempera-

ture setting by more than 7°F, re-

place the control board. See page

Plumbing lines should not rest on

the counter top.

The brewer must be connected to

a cold water supply.

Remove the tank lid and clean in-

side of tank with a deliming agent,

if necessary.

HEATING CIRCUIT (cont.)

33030 052600

Page 14

DIAGNOSTICS

Intermittent flashing of the READY indicator indicates that a fault exists. Count the number of flashes between

pauses and use this chart as a guide to investigating the fault.

FLASHES CAUSE THINGS TO CHECK

1 Reserved for future use.

2 Low Tank Level Fault - Water pressure

Level probe dry too long after fill valve is energized Level probe wiring

Temperature probe wiring

Fill valve wiring, function, & strainer

3 Low Water Temperature Fault - Tank heater , limit thermostat, temperature

Excessive heating time. probe wiring

4 Reserved for future use.

5 Temp Sensor Out-of-Range - High Sensor not connected to circuit board

6 Temp Sensor Out-of-Range - Low Sensor wires shorted together or to chassis

33030 052600

Page 15

SERVICE

This section provides procedures for testing and

replacing various major components used in this

brewer should service become necessary. Refer to

Troubleshooting

for assistance in determining the

cause of any problem.

WARNING - Inspection, testing, and repair of electri-

cal equipment should be performed only by qualified

service personnel. The brewer should be disconnected

from the power source when servicing, except when

electrical tests are required and the test procedure spe-

cifically states to plug in the brewer.

COMPONENT ACCESS

WARNING - Disconnect the brewer from the power

source before the removal of any panel or the replace-

ment of any component.

All components are accessible by the removal of

the top cover and rear access panel.

The top cover is attached with one #4-40 screw.

Removal of the top cover will allow access to on/off

switch, start switch, faucet switch, sanitize switch, hot

water solenoid valve, cold water solenoid valve, con-

trol board, limit thermostat tank heater,

The rear access panel is attached with six #8-32

screws. Removal of the rear panel will allow access to

the brew solenoid valve.

FIG. 1 COMPONENT ACCESS

P2150.40

Contents

Brew Solenoid Valve ............................................ 16

Cold Water Solenoid Valve (for faucet) ................ 17

Faucet Switch ...................................................... 18

Hot Water Solenoid Valve (for faucet).................. 19

Limit Thermostat ................................................. 20

ON/OFF Switch..................................................... 21

Sanitize Switch .................................................... 22

START Switch ...................................................... 23

Tank Heater .......................................................... 24

Control Board ...................................................... 25

Wiring Diagrams.................................................. 26

33030 052600

Page 16

SERVICE (cont.)

BREW SOLENOID VALVE

FIG. 2 BREW SOLENOID VALVE

Location:

The brew solenoid valve is mounted on the left side

in the bottom rear of the brewer.

Test Procedures:

1. Disconnect the brewer from the power source.

2. Disconnect the white and white/green wires from

the solenoid valve. With the ON/OFF switch in the

"ON" upper position press the start switch.

3. With a voltmeter, check the voltage across the

white and white/green wires. Connect the brewer

to the power source. The indication must be 120

volts ac.

4. Disconnect the brewer from the power source,

If voltage is present as described, proceed to #5

If voltage is not present as described, refer to

Wiring

Diagram

and check brewer wiring harness.

5. Check for continuity across the solenoid valve coil

terminals.

If continuity is present as described, reconnect the

white and white/green wires to the solenoid valve.

If continuity is not present as described, replace the

solenoid valve.

6. Check the solenoid valve for coil action. Connect

the brewer to the power source. With ON/OFF

switch in the "ON" upper position press start switch

and listen carefully in the vicinity of the solenoid

valve for a "clicking" sound as the coil magnet

attracts.

7. Disconnect the brewer from the power source.

If the sound is heard as described and water will not

pass through the solenoid valve, there may be a block-

age in the water line before the solenoid valve or, the

solenoid valve may require inspection for wear, and

removal of waterborne particles.

If the sound is not heard as described, replace the

solenoid valve.

Removal and Replacement:

1. Remove all wires from solenoid valve.

2. Turn off the water supply to the brewer.

3. Disconnect the water lines to and from the sole-

noid valve.

4. Remove the two hex-head screws holding the

mounting bracket to the brewer base.

5. Securely install the new solenoid valve.

6. Attach the mounting bracket to the brewer base.

7. Securely fasten the water lines to and from the

solenoid valve.

8. Refer to Fig.3 when reconnecting the wires.

FIG.3 SOLENOID VALVE TERMINALS

P2153.40

33030 052600

WHI to Power Cord

WHI/GRN to Control

Board J1-4

P2158.40

Page 17

SERVICE (cont.)

COLD WATER SOLENOID VALVE (for faucet)

33030 052600

WHI to Power Cord

WHI/BLU to

Control Board J1-3

FIG. 5 COLD WATER VALVE TERMINALS

P2154.45

FIG. 4 COLD WATER SOLENOID VALVE

Location:

The cold water solenoid valve for the faucet is lo-

cated inside the hood. It is located in front of the

tank, on the right side.

Test Procedures:

NOTE: Remove the white/violet wire from the hot wa-

ter solenoid valve before testing the cold water valve.

1. Disconnect the brewer from the power source.

2. Disconnect the white and white/blue wires from

the solenoid valve. Hold the faucet switch in the

Green Tea position.

3. With a voltmeter, check the voltage across the

white and white/blue wires. Connect the brewer

to the power source. The indication must be 120

volts ac.

4. Disconnect the brewer from the power source.

If voltage is present as described, proceed to #5.

If voltage is not present as described, refer to

Wiring

Diagram

and check brewer wiring harness.

5. Check for continuity across the solenoid valve coil

terminals.

If continuity is present as described, reconnect the

white and white/blue wires to the solenoid valve.

If continuity is not present as described, replace the

solenoid valve.

6. Check the solenoid valve for coil action. Connect

the brewer to the power source. When pressing

the faucet switch in the Green Tea position listen

carefully in the vicinity of the solenoid valve for a

"clicking" sound as the coil magnet attracts.

7. Disconnect the brewer from the power source.

If the sound is heard as described and water will not

pass through the solenoid valve, there may be a block-

age in the water line before the solenoid valve or, the

solenoid valve may require inspection for wear, and

removal of waterborne particles.

If the sound is not heard as described, replace the

solenoid valve.

Removal and Replacement

1. Remove all wires from solenoid valve.

2. Turn off the water supply to the brewer.

3. Disconnect the water lines to and from the sole-

noid valve.

4. Remove the two #8-32 nuts holding the mount-

ing bracket to the brewer.

5. Lift out the bracket.

6. Remove the two #8-32 screws holding the sole-

noid valve to the mounting bracket.

7. Securely install the new solenoid valve to the

mounting bracket.

8. Attach the mounting bracket to the brewer.

9. Securely fasten the water lines to and from the

solenoid valves.

10. Refer to Fig. 5 when reconnecting the wires.

11. Refer to Fig. 9 when reconnecting white/violet wire

to the hot water solenoid valve.

P2158.40

Page 18

SERVICE (cont.)

FAUCET SWITCH

P2150.40

33030 052600

FIG. 6 FAUCET SWITCH

P2155

ORA to Control

Board J3-1

VIO to Control

Board J3-2

YEL to Control

Board J3-3

FIG. 7 FAUCET SWITCH TERMINALS

Location:

The faucet switch is located in the front of the

hood, above and to the left of the brew funnel, and to

the right of the faucet.

Test Procedures:

1. Disconnect the brewer from the power source.

2. Removes the wires from the terminals.

3. Check for continuity across the violet and orange

terminals. Press switch for "Green Tea". Continu-

ity should be present.

4. Check for continuity across the violet and yellow

terminals. Press switch for "Black Tea". Continuity

should be present. No continuity should be

present across any terminals when switch is in

center position.

If continuity is present as described, the switch is

operating properly.

If continuity is not present as described, replace the

switch.

Removal and Replacement:

1. Remove the wires from the switch terminals.

2. Compress the clips inside the hood and gently

push the switch through the opening.

3. Push the new switch into the opening and spread

the clips to hold the switch captive in the hood.

4. Refer to Fig. 7 when reconnecting the wires.

Page 19

SERVICE (cont.)

HOT WATER SOLENOID VALVE (for faucet)

33030 030101

WHI/VIO to Relay

WHI to Power Cord

P2156.50

FIG. 9 HOT WATER VALVE TERMINALS

FIG. 8 HOT WATER SOLENOID VALVE

Location:

The hot water solenoid valve for the faucet is lo-

cated inside the hood. It is located in front of the

tank, on the left side.

Test Procedures:

NOTE: Remove the white/blue wire from the cold wa-

ter solenoid valve before testing the hot water valve.

1. Disconnect the brewer from the power source.

2. Check the water level in the tank to confirm that it

is within 1/2" from the top of the tank.

3. Connect the brewer to the power source.

4. Check the dispense valve for coil action. Place the

ON/OFF switch in the "ON" position, press and hold

the faucet switch in the Black Tea position. Listen

carefully in the vicinity of the hot water dispense

valve for a "clicking" sound as the coil magnet

attracts and repels the plunger.

5. Disconnect the brewer from the power source.

If the sound is heard as described, there may be a

blockage in the dispense valve or the water line to the

sprayhead. Remove the dispense valve and inspect for

wear, and remove waterborne particles.

If the sound is not heard as described, proceed to #6.

P2158.40

6. Connect the voltmeter lead ends to the hot water

dispense valve coil terminals. Connect the brewer

to the power source. Place "ON/OFF" Switch in the

"ON" position. Press and hold the Black Tea faucet

switch. The indication must be 120 volts ac .

7. Disconnect the brewer from the power source.

If voltage is present as described, but no coil action is

observed, nor "clicking" heard, dispense valve is de-

fective. Replace valve and test again to verify repair.

If voltage is not present as described, refer to

Wiring

Diagrams

and check the brewer wiring harness. Also

check the control board for proper operation. See

Page 25.

Removal and Replacement

1. Remove all wires from solenoid valve.

2. Turn off the water supply to the brewer.

3. Disconnect the water lines to and from the sole-

noid valve.

4. Remove the two #8-32 nuts holding the solenoid

valve to the hood.

5. Securely install the new solenoid valve to the hood.

6. Securely fasten the water lines to and from the

solenoid valves.

7. Refer to Fig. 9 when reconnecting the wires.

8. Refer to Fig. 5 when reconnecting the white/blue

wire to the cold water valve.

Page 20

SERVICE (cont.)

LIMIT THERMOSTAT

FIG. 10 LIMIT THERMOSTAT

Location:

The limit thermostat is located inside the hood on

the tank lid.

Test Procedure:

1. Disconnect the brewer from the power source.

2. With a voltmeter, check the voltage across the blue

wire on the limit thermostat and the white wire on

the tank heater terminal. Connect the brewer to

the power source. The indication must be 120

volts ac.

3. Disconnect the brewer from the power source.

If voltage is present as described, proceed to #4.

If voltage is not present as described, refer to the Wir-

ing Diagrams and check the wiring harness.

4. Remove the black wire from the limit thermostat.

5. Check the voltage across the exposed terminal of

the limit thermostat and the white wire on the tank

heater with a voltmeter. Connect the brewer to the

power source. The indication must be 120 volts

ac.

6. Disconnect the brewer from the power source.

If voltage is present as described, reconnect the black

wire to the limit thermostat. The limit thermostat is

operating properly.

If voltage is not present as described, replace the limit

thermostat.

Removal and Replacement

1. Remove both wires from the limit thermostat ter-

minals.

2. Remove the two #8-32 nuts attaching the limit ther-

mostat to the tank.

3. Install the new limit thermostat and secure into

place with the two #8-32 nuts.

4. Refer to Fig. 11 when reconnecting the wires.

BLU to Control

Board RL-1

BLK to Tank Heater

FIG. 11 LIMIT THERMOSTAT TERMINALS

P1776.50

33030 052600

P2159.40

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Bunn TU3QF-EZ User manual

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